nrf24l01的多点通信（发送部分）的代码，已经测试完成。-the send2 code for nrf24l01 which copes with the multi-node communication

介绍NRF24L01的多通道（Multiple Pipes）,其中文件nrf24l01.c实现此射频芯片在多通道下的通信，多发单收，同样提供了发、发的HEX文件便于实验。-NRF24L01 introduced multi-channel (Multiple Pipes), which documents the achievement of this nrf24l01.c RF chips in a multi-channel communications, multi-single-admi